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Title:
AUSTENITIC STAINLESS STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/241851
Kind Code:
A1
Abstract:
Provided is an austenitic stainless steel material having excellent hydrogen embrittlement resistance and high strength. This austenitic stainless steel material has a chemical composition in terms of mass% of no more than 0.100% C, no more than 1.00% Si, no more than 5.00% Mn, 15.00-22.00% Cr, 10.00-21.00% Ni, 1.20-4.50% Mo, no more than 0.050% P, no more than 0.050% S, no more than 0.100% Al, no more than 0.100% N, and 0-0.70% Cu, the remainder comprising Fe and impurities, the austenitic grain size number based on ASTM E112 of the austenitic stainless steel material is 5.0 to less than 8.0, the dislocation cell structure ratio in a cross section perpendicular to the longitudinal direction of the austenitic stainless steel material is 50% to less than 80%, and the number density of deposits having a major axis of 1.0 µm or greater is 5.0/0.2 mm2 or less.

Inventors:
YAMAMURA MISAHO (JP)
NAKAMURA JUN (JP)
Application Number:
PCT/JP2020/021422
Publication Date:
December 03, 2020
Filing Date:
May 29, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/00; C22C38/00; C22C38/60
Domestic Patent References:
WO2004111285A12004-12-23
WO2015159554A12015-10-22
WO2005068674A12005-07-28
WO2016068009A12016-05-06
Foreign References:
JPH0813095A1996-01-16
JP2009079240A2009-04-16
CN107587078A2018-01-16
JP2019194357A2019-11-07
Other References:
See also references of EP 3978635A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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